Rule 32.1, Fed. R. App. P., permits unrestricted citation of unpublished federal judicial opinions, orders, judgments, or other written dispositions issued on or after January 1, 2007. Citation of this court's unpublished dispositions issued prior to January 1, 2007, in briefs and oral argument in this court and in the district courts within this circuit is disfavored, except for the purpose of establishing res judicata, estoppel, or law of the case. Loc. R. 32.1. If counsel believes, nevertheless, that an unpublished disposition of this court issued prior to January 1, 2007, has precedential value in relation to a material issue in a case and that there is no published opinion that would serve as well, such disposition may be cited.